25、Mary and Peter were having a picnic with some friends near a river when Mary shouted, "Look! That's a spaceship up there and it's going to land here."
Frightened by the strange spaceship, _ _ 21 _ _ of the young people got into their cars and drove away as quickly as possible. Peter loved Mary and always stayed close to her. They, more _ _ 22 _ _ than frightened, watched the spaceship land and saw a door open. When nobody came out, they went to look into it. In the center of the floor, there was a pile of food. Peter followed Mary into the spaceship and did not _ _ 23 _ _ the door close behind him. The temperature fell rapidly and the two young people lost their consciousness.
When they came to life, they were surprised to see that they were back by the river again. The spaceship had gone. There car was nearby.
"What happened?" asked Mary. Peter scratched his head, saying slowly, "Don't ask me. Perhaps we had a _ _ 24 _ _ . Come on. It's time to go home."
After driving about fifty meters, they found their way blocked by a thick wall made of something like glass. On the other side of the wall, a few strange beings stopped to _ _ 25 _ _ it and read a notice which, translated into English, said: "New arrivals at Zoo: a pair of earth inhabitants in their natural surroundings with their house on wheels."